<!DOCTYPE html>
<html>

	<head>
		<meta charset="UTF-8">
		<title></title>
	</head>

	<body>
	</body>
	<script type="text/javascript">
		Date.prototype.pattern = function(fmt) {
			var o = {
				"M+": this.getMonth() + 1, //月份         
				"d+": this.getDate(), //日         
				"h+": this.getHours() % 12 == 0 ? 12 : this.getHours() % 12, //小时         
				"H+": this.getHours(), //小时         
				"m+": this.getMinutes(), //分         
				"s+": this.getSeconds(), //秒         
				"q+": Math.floor((this.getMonth() + 3) / 3), //季度         
				"S": this.getMilliseconds() //毫秒         
			};
			var week = {
				"0": "日",
				"1": "一",
				"2": "二",
				"3": "三",
				"4": "四",
				"5": "五",
				"6": "六"
			};
			if(/(y+)/.test(fmt)) {
				fmt = fmt.replace(RegExp.$1, (this.getFullYear() + "").substr(4 - RegExp.$1.length));
			}
			if(/(E+)/.test(fmt)) {
				fmt = fmt.replace(RegExp.$1, ((RegExp.$1.length > 1) ? (RegExp.$1.length > 2 ? "星期" : "周") : "") + week[this.getDay() + ""]);
			}
			for(var k in o) {
				if(new RegExp("(" + k + ")").test(fmt)) {
					fmt = fmt.replace(RegExp.$1, (RegExp.$1.length == 1) ? (o[k]) : (("00" + o[k]).substr(("" + o[k]).length)));
				}
			}
			return fmt;
		}
console.log((new Date()).pattern("EE yyyy-MM-dd"))
		
	</script>

</html>